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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 abdelhadi 3855
#2 AbdAllah 3765
#3 hilalimohammed 3565
#4 adrianvxck81 3545
#5 Ghayati_mohamed 3472
Recent Solves
Computing Shared Secrets anthonymuendo
Manyprime xtea418
ASCII pvisc
Confusion through Substitution JakubKoz106
Great Snakes pvisc
Recent Solutions
A Joke Cipher (HKCERT CTF) infernosalex 0
Lack of Entropy (Firebird Internal CTF) ConnorM 1
Curveball nidanpoudel 0
Oracular Spectacular Link 0
Greatest Common Divisor Supto69 0

Level Up

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